Nano Wood Seal SP 30 is 100% moisture blocking for all wooden surfaces. Nano Wood Seal SP 30 has a SG of less than 0.8 and therefore stains must be applied with a mixture of turpentine prior to applying Nano Wood Seal. Nano Wood Seal SP 30 and SP 33 is 100% waterproof and UV resistant with QUV tests conducted to 2500 hours which does not need expensive products like Tinuvin for UV protection. The longer the product is on, the stronger it becomes. Nano Wood Seal can be applied over existing varnishes without sanding which makes it extremely economical to use. It adheres even to plastic.